CN105442692B - A kind of high performance cement-based composites pipe - Google Patents
A kind of high performance cement-based composites pipe Download PDFInfo
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- CN105442692B CN105442692B CN201510903478.XA CN201510903478A CN105442692B CN 105442692 B CN105442692 B CN 105442692B CN 201510903478 A CN201510903478 A CN 201510903478A CN 105442692 B CN105442692 B CN 105442692B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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Abstract
The present invention is a kind of high performance cement-based composites pipe, and polyvinyl alcohol fiber reinforced cement mortar (2), framework of steel reinforcement (3) is used to be made；One end of the pipe is bellmouth (1), and the other end is socket (4), and bellmouth (1) and socket (4) complement each other to form pipeline.The pipe workpiece quality invented is light, and under manufacture same inner diameter, the cement concrete pipe technical requirements of same bearer ability, which is the 30%~88% of ordinary reinforced concrete thickness of pipe wall.The pipe has good bearing capacity, cracking resistance, improves the impermeability and durability of pipeline, provides novel high-quality tubing for water supply and sewage work.
Description
Technical field
The present invention relates to plumbing concrete duct field more particularly to a kind of high performance cement-based composites tubing.
Background technique
Raw material sources needed for pipe of concrete manufactures are abundant, and cost is relatively low, and easy for construction, intensity and durability are preferable,
It is widely applied in water supply and sewage work.But defect is apparent：(1) using the ordinary steel of concrete material manufacture
Type reinforced concrete pipeline, since concrete tensile strength and stretching ductility are low, maximum tension strain is 0.02% or so, is easy to happen
Brittle fracture, or even pipe explosion accident occurs, generally concrete is not allowed to generate elongation strain in design specification.Therefore, common mixed
Solidifying soil pipeline wall thickness (wall thickness that pipeline wall thickness refers to pipe shaft being narrated in this specification, do not refer to the wall thickness of bellmouth and socket, similarly hereinafter)
Larger, wall thickness is about the 1/10 of bore, causes transport and installation cost higher；(2) common concrete material is brittle fracture,
Crack propagation is fast, and crack width is big, by the corrosion of reinforcing bar in accelerating tube, destroys its impermeability；(3) ordinary reinforced concrete pipeline
It is smaller with load increase ring stiffness variation range, it cannot rely on the effect that ring stiffness obtains the native side pressure of pipe week that reduces when buried, lead
Cause the ability for resisting earthquake, ground shock etc. poor.
And prestressing force steel sleeve concrete pipe (PCCP pipe), although improving coagulation by winding compressor wire outside pipe
The tensile capacity of native tube core, but compressor wire, once corrosion fracture occurs, the safe operation of pipeline will be difficult to ensure, and pre-
The maintenance of pipeline is also more difficult after stress wire fracture.
Summary of the invention
The technical problem to be solved by the present invention is to：A kind of high performance cement-based composites pipe is provided, it is existing to improve
Bearing capacity, cracking resistance and the anti-overload ability of concrete duct reduce the self weight of existing concrete pipeline.
The present invention solves these technical problems, and the following technical solution is employed：
High performance cement-based composites pipe provided by the invention, uses polyvinyl alcohol fiber reinforced cement mortar, steel
Tendons skeleton is made；One end of the pipe is bellmouth, and the other end is socket, and bellmouth and socket complement each other to form pipeline.
The polyvinyl alcohol fiber reinforced cement mortar is less than or is waited with cement, flyash, metakaolin and partial size
It is basis material in the sand of 0.60mm, incorporation water, vinal, polycarboxylate water-reducer and viscosity modifier mixing form,
The quality proportioning of the raw material is：
Cement：Flyash：Metakaolin：Sand：Water：Vinal；Polycarboxylate water-reducer：Viscosity modifier=1：
1.2~2.4：0~0.11：1~1.52：0.68~1.04：0.050~0.076:0.009~0.013:0.00056~
0.00085。
The polyvinyl alcohol fiber reinforced cement mortar, elastic mould value be 10~25GPa, compression strength be 25~
60MPa, tensile strength are 3~8MPa, and limit tensile strain is 0.02~0.06.
The high performance cement-based composites pipe, when triangle test being used to apply quasi-static loading, with external pressure load
Increasing its external pressure load-tube top displacement relation curve includes elastic stage, hardening phase and cracking stage, is unloaded in elastic stage
When, deformation can restore completely；In hardening phase and the unloading of cracking stage, deformed part restores.
The high performance cement-based composites pipe, in hardening phase, in Guan Yaochu outer wall, tube top inner wall, pipe
The visible a plurality of fine and closely woven crackle of the Tension Stress Zones such as bottom inner wall, crackle number are increasing, and crack width is 0.04~0.2mm.
The high performance cement-based composites pipe declines in the ring stiffness of hardening phase, and the ring of hardening phase is rigid
Degree is the 40%~80% of elastic stage ring stiffness.
The high performance cement-based composites pipe, when external pressure load, tube top displacement are used failing load respectively, destroyed
It include two point of interfaces between elastic stage, hardening phase and cracking stage three after the displacement normalization of tube top vertical direction, two hand over
Point corresponding normalization load in boundary's is respectively 0.25~0.35 and 0.60~0.75, the corresponding normalized displacements difference of two point of interfaces
For 0.05~0.01 and 0.30~0.40.
Above-mentioned high performance cement-based composites pipe provided by the invention, in manufacture same inner diameter, same bearer energy
Under the cement concrete pipe technical requirements of power, which is the 30%~88% of ordinary reinforced concrete thickness of pipe wall.
Above-mentioned high performance cement-based composites pipe provided by the invention works normally section packet after buried
Include elastic stage and hardening phase.
High performance cement-based composites pipe of the present invention compared with prior art, has following main prominent effect：
First, this tube wall is thin, from heavy and light；
When bore and bearing capacity under the same conditions, the wall thickness of this pipe is the 30% of ordinary reinforced concrete thickness of pipe wall
~88%.
Second, hardening phase crack width is controllable：
This pipe is the fine and closely woven crack initiation of multiple cracks in hardening phase, and crack width is controllable to be less than 0.2mm.
Third, ring stiffness can change in a big way；
This pipe is in 40%~80% that hardening phase ring stiffness is elastic stage ring stiffness.In this way, when pipeline bears overload,
The effect of soil side pressure when can play buried improves pipeline and resists the external ability overloaded.
4th, there is protective effect to framework of steel reinforcement.
This pipe has multiple cracking cracking property, and crack width is controllable, shields to framework of steel reinforcement in pipe, delays steel
Muscle corrosion.
5th, application range is widened.
High performance cement-based composites pipe light weight, can resist biggish deformation, and pipeline can be in subgrade, marsh
It is used under the environment such as ground, earthquake prone areas.
6th, manufacture craft is simple.
Prepared polyvinyl alcohol fiber reinforced cement mortar working is good, and fiber is uniformly dispersed, and when casting is easy to fill
Molding, it is easy for construction.
In short, the present invention has good bearing capacity, cracking resistance, the impermeability and durability of pipeline are improved, is
Water supply and sewage work provide novel high-quality tubing.
Detailed description of the invention
Fig. 1 is high performance cement-based composites pipe structural schematic diagram；
Fig. 2 is pipe force diagram when triangle test is tested；
Fig. 3 is that high performance cement-based composites pipe normalizes load-normalized displacements relation curve；
Fig. 4 is that polyvinyl alcohol fiber reinforced cement mortar is uniaxially stretched assay maps；
Fig. 5 is the left view of Fig. 4.
Fig. 6 is the curves of stress-strain relationship that polyvinyl alcohol fiber reinforced cement mortar is uniaxially stretched；
Fig. 7 is that the camera of multiple cracks expansion process when polyvinyl alcohol fiber reinforced cement mortar is uniaxially stretched shoots photo；
Fig. 8 is the relationship for surveying high performance cement-based composites pipe tube top external pressure load and tube top inner wall lead vertical deviation
Curve；
Fig. 9 is that actual measurement high performance cement-based composites pipe normalizes load-normalized displacements relation curve；
Figure 10 is the relationship of external pressure load and lead vertical deviation when surveying high performance cement-based composites pipe CYCLIC LOADING
Curve；
Figure 11 is the relation curve for surveying reinforcing bar element mortar pipe tube top external pressure load and tube top inner wall lead vertical deviation.
In figure：1. bellmouth；2. polyvinyl alcohol fiber reinforced cement mortar；3. framework of steel reinforcement；4. socket；5. tube top；6. pipe
Waist；7. tube bottom.
Specific embodiment
The invention will be further described with attached drawing combined with specific embodiments below, but should not be construed as to limit of the invention
System.
High performance cement-based composites control provided by the invention is for simple process.Such as：With ordinary portland cement,
The sand of I grades of flyash, metakaolin and partial size less than or equal to 0.60mm is basis material, and incorporation water, gathers vinal
Carboxylic acid water reducer and viscosity modifier mixing form.It is cement with reference to match ratio (mass ratio)：Flyash：Metakaolin：Sand：
Water：Vinal；Polycarboxylate water-reducer：Viscosity modifier=1：1.2~2.4：0~0.11：1~1.52：0.68~
1.04：0.050~0.076:0.009~0.013:0.00056~0.00085.
First polycarboxylate water-reducer is added to the water, polycarboxylate water-reducer aqueous solution is made.Using concrete mixer by water
The dry mixing such as mud, flyash, quartz sand, metakaolin 1 minute；Stirring 2 minutes is added in polycarboxylate water-reducer aqueous solution again.Side again
Stirring side is sprinkled into vinal, lasts 3 minutes.It is eventually adding viscosity modifier, to adjust the viscosity of mix, stirring
1 minute.According to procedure operation specified in GB/T2419-2005, its fluidity is tested, is controlled in 190~220mm.It will be vertical
Pipe making mold is fixed on flat vibrating table, then framework of steel reinforcement is fixed in vertical Pipe making mold.Framework of steel reinforcement is using with ribbing
Reinforcement welding forms.The parameters such as the diameter of reinforcing bar, vertical muscle radical, screw pitch are pressed in framework of steel reinforcement《Reinforced concrete sewer pipe tube body
Structure size and Reinforcement Design atlas》It determines.Mixture, vibration moulding are poured into mold.Using band mould steam curing, or
Indoor standing demoulds after 24 hours, then is covered water seasoning 28 days with wet gunnysack.
The basic structure of high performance cement-based composites pipe is as shown in Fig. 1.Increase including bellmouth 1, vinal
The compositions such as strong cement mortar 2, framework of steel reinforcement 3 and socket 4.Since the polyvinyl alcohol fiber reinforced cement mortar ductility is good,
Drawing or compression can be born, in pipe by external pressure load (including formation such as soil pressure, live load, soil settlement, earthquake loads
Various composite conditions) generate draw, compressive strain when polyvinyl alcohol fiber reinforced cement mortar can be with reinforcing bar compatible deformation, it is ensured that poly- second
Enol fiber reinforced cement mortar and framework of steel reinforcement shared external pressure load.Therefore, high performance cement-based composites Guan Cheng
Loading capability is high.
It presses《Test methods of concrete and reinforced concrete drainage and sewer pipes GB/T16752-2006》Specified in test method (i.e.
Triangle test) test of bearing capacity is carried out to high performance cement-based composites pipe, pipe force diagram such as attached drawing 2 when test.Attached drawing 2
In, 2 fulcrums are arranged in tube bottom, and tube top is external pressure load force application location.And measure in attached drawing 2 (i.e. 5 inner wall highest of tube top at A point
At point) displacement (being indicated with w) of vertical direction.External pressure load is using the load expression acted in pipe unit length, i.e.,：
In formula：F is the external pressure load that load test equipment currently applies, and L is test length of tube.
Moreover, the failing load of high performance cement-based composites pipe, cracking load etc. are using in GB/T16752-2006
Definition, i.e., in test process when tube damage, load in pipe unit length is that cracking load (uses PmaxIt indicates)；Test process
In when fracture width reaches 0.20mm, the load of pipe unit length is that cracking load (uses PcIt indicates).
When applying quasi-static loading using triangle test, external pressure load-tube top displacement of high performance cement-based composites pipe
Relation curve (i.e. P-w curve) will include three phases, i.e. elastic stage, hardening phase and cracking stage, each section in different
Linear relationship.In elastic stage, P-w curve is the straight line by origin, manages inside and outside wall flawless and occurs.Into hardening phase
Afterwards, the P-w slope of curve reduces, and in attached 5 inner wall of tube top shown in Fig. 2,6 outer wall of pipe waist (including pipe waist at left and right two), tube bottom
The visible a plurality of fine and closely woven crackle of the Tension Stress Zones such as 7 inner walls, crackle number are increasing, and crack width is 0.04~0.2mm.With lotus
Load continues to increase, and the P-w slope of curve further decreases, and into the cracking stage, pipe surface crack width is obviously increased, external pressure load
Finally reach failing load (Pmax)。
In order to describe the characteristic of invented high performance cement-based composites pipe, and internal diameter of the characteristic independent of pipe
And wall thickness, external pressure load and tube top displacement are used into P respectivelymax(w is displaced with A point vertical direction when destroyingu) normalized, i.e.,：
In formula：External pressure load in the pipe unit length that P currently applies for tube top；PmaxFor the failing load of pipe；W is at A point
Displacement currently generate, vertical direction, wu(external pressure load reaches F when to destroymax) displacement of A point vertical direction.
F- δ curve is then obtained by P-w curve, as shown in Fig. 3.Identical as P-w curvilinear characteristic, f- δ curve includes elasticity
The three phases such as stage, hardening phase and cracking stage.The coordinate of two separations between three phases is as shown in Fig. 3, i.e.,
Elastic stage is from point (0,0) to point (δf,ff), hardening phase is from point (δf,ff) arrive point (δc,fc), the cracking stage is from point (δc,fc)
To point (1,1).The range of each parameter is respectively：δf=0.05~0.10, ff=0.25~0.35, δc=0.3~0.4, fc=
0.60~0.75.Therefore, the corresponding normalization load of two point of interfaces is respectively 0.25~0.35 and 0.60~0.75, two point of interfaces
Corresponding normalized displacements are respectively 0.05~0.01 and 0.30~0.40.
As crack number increases, ring stiffness is reduced, but load continues to increase, until reaching Pmax.It is rigid in hardening phase ring
Degree is the 40~80% of elastic stage ring stiffness.The decline of hardening phase ring stiffness is conducive to improve soil pressure around pipe and acts on, increases
Add pipe bearing capacity.In elastic stage unloading, deformation can restore completely.And in hardening phase and the unloading of cracking stage, by
It is generated in crackle and reinforcement yielding, deformed part restores.But high performance cement-based composites pipe can be in hardening phase
Work.On the one hand, in hardening phase, the crack width of the pipe is split lower than cracking load is corresponding as defined in GB/T16752-2006
Line width (i.e. 0.20mm)；On the other hand, when the pipe is embedded to underground, due to being reduced in hardening phase ring stiffness, soil around pipe
Pressure acts on the bearing capacity that pipeline can be improved.
By taking the pipe of concrete of several nominal bore diameters as an example, table 1 lists high performance cement-based composites pipe and (uses in table 1
HP is indicated) wall thickness (is indicated) in table 1 with CP with ordinary reinforced concrete pipe.In table 1, cracking load and failing load from
《Concrete and reinforced concrete drainage and sewer pipes GB/T11836-2009》Middle I~III level pipe regulation.The longitudinal reinforcement of framework of steel reinforcement
Diameter, longitudinal reinforcement radical (numerical value i.e. in []), circumferential reinforcement diameter, circumferential reinforcement screw pitch (numerical value i.e. in { }) are pressed《Steel
Reinforced concrete drainage pipe pipe structure size and Reinforcement Design atlas》It determines.Longitudinal reinforcement is evenly arranged along pipe cross-sectional circumferential,
Distance of the circumferential reinforcement between pipe range equidistant placement, adjacent circumferential reinforcement is known as screw pitch.High performance cement-based composites pipe by
It is small compared with ordinary reinforced concrete pipe in wall thickness, only with single layer arrangement of reinforcement.Ordinary reinforced concrete nominal pipe diameter is less than or equal to
When 1000mm, using single layer arrangement of reinforcement；And when nominal bore diameter is greater than 1000mm using the double-deck arrangement of reinforcement.Two kinds of pipes remove in terms of arrangement of reinforcement
The arrangement of reinforcement number of plies narrated has outside difference, for the tubing of identical nominal bore diameter and grade, longitudinal reinforcement diameter, longitudinal reinforcement root
Number, circumferential reinforcement diameter, circumferential reinforcement screw pitch etc. are identical.Concrete reinforced pipe minimum wall thickness (MINI W.) is obtained according to GB/T11836-2009
It arrives.High performance cement-based composites pipe minimum wall thickness (MINI W.) is obtained by test and theoretical calculation method, is manufactured and is tested first
Several high performance cement-based composites pipe improves according to test result and has modified theoretical calculation model, finally obtains not
The minimum wall thickness (MINI W.) of same nominal bore diameter, different stage pipe.
As it can be seen that the pipeline of manufacture same inner diameter, same bearer ability, high performance cement-based composites thickness of pipe wall is common
The 30%~88% of armored concrete thickness of pipe wall.When being greater than 1600mm such as bore, high performance cement-based composites thickness of pipe wall
It is the 32%~47% of ordinary reinforced concrete thickness of pipe wall, the former advantage in terms of saving material, reducing self weight is more obvious.
Specific embodiment 1：
Cement：Flyash：Metakaolin：Sand：Water：Vinal：Polycarboxylate water-reducer：Viscosity modifier=1：
2.0：0.11：1.35：0.93：0.067:0.011:0.0007.Vinal is limited by Anhui Province dimension new high-tech material share
Company's production, fibre diameter 0.035mm, length 12mm, elasticity modulus 39.4GPa, tensile strength 1092MPa.It adopts
The I grade fine coal of the ordinary portland cement (trade mark P.O42.5), Wuhan Yangluo power plant that are produced with Hubei Hua Xin Cement Co., Ltd
Ash.This real estate sand is sieved, and the mass ratio of various sand grains is in the sand of selection, and partial size is the sand of 0.30~0.60mm：Partial size is
The sand of 0.15~0.30mm：Partial size is the sand of 0.106~0.15mm：Partial size is sand=20 of 0.075~0.106mm：65:13:
2.Metakaolin is the production of Period In Maoming kaolinite scientific & technical corporation, and main component is shown in Table 2.Polycarboxylate water-reducer is ADVA152,
It is produced by Grace China Ltd. of the U.S..Viscosity modifier is Rheoplus420 (BASF AG's production).
First polycarboxylate water-reducer is added to the water, polycarboxylate water-reducer aqueous solution is made.Using concrete vertical blender
By cement, flyash, inclined silicon phosphorus soil, quartz sand dry mixing 1 minute；Polycarboxylate water-reducer aqueous solution is added again, stirs 2 minutes and makes
Obtain cement mortar.It is sprinkled into vinal while stirring again, lasts 3 minutes.It is eventually adding viscosity modifier, to adjust mix
The viscosity of material stirs 1 minute.According to procedure operation specified in GB/T2419-2005, using NLD-3 type cement gel sand flow
Dynamic degree tester test, fluidity is in 190~220mm.Tensile sample, 5 institute of size such as attached drawing 4 and attached drawing is made in mix
Show.It is demoulded after 24 hours, then water seasoning 28 days at normal temperature is covered using wet gunnysack.Sample is fixed on stretching clamp,
Elongation strain is measured using accurate LVDT displacement meter.Load-deformation curve when measuring stretching is as shown in Fig. 6.As it can be seen that mixing
Polyvinyl alcohol fiber reinforced cement mortar after cement matrix occurs just to split, do not lose bearing capacity, but with strain
Increasing stress increased, the strain hardening characteristic with metalloid material, and elasticity modulus is 15.7 ± 1.3GPa, stretch strong
Degree is 5.56 ± 0.48MPa, and the corresponding elongation strain of maximum tension stress (referred to as limit tensile strain) reaches 0.04 ± 0.004.
A plurality of parallel hair check can be observed in drawing process, as shown in Fig. 7.As it can be seen that with increase (Fig. 7 arrow of elongation strain
Direction is the increased direction of elongation strain), hair check item number increases.In final stage, the close saturation of crackle item number.With attached
In Fig. 7 for the 2nd photo of inverse, there are parallel crack 30 or so in photo height (about 30mm), neighboring cracks average headway
About 1mm, this is to be saturated crack spacing.According to grinding about polyvinyl alcohol fiber reinforced cement mortar tensile property both at home and abroad
Study carefully report, is saturated crack spacing in 2mm or so.Therefore the resulting saturation crack spacing of the present embodiment is than the number of domestic and international existing report
According to reducing by 1 times or so, even if the material for illustrating that the present embodiment is prepared still has good crackle when close to ultimate elongation load
Width control ability.According to elongation strain, elasticity modulus and crackle item number, can calculate saturation state crackle mean breadth
About 0.04mm.Meanwhile the polyvinyl alcohol fiber reinforced cement mortar cube for using identical preparing process that side length is made as 70mm
Sample, measuring its compression strength is 35.5 ± 2.2MPa.
Embodiment 2：
Raw material ratio and preparing process are the same as embodiment 1.
Production high performance cement-based composites bore is 375mm, wall thickness 25mm, pipe range 2.5m.The bellmouth of pipe is inserted
The reference of oral area position《Concrete and reinforced concrete drainage and sewer pipes GB/T11836-2009》Middle flexible joint Type B bell and spigot pipe fitting system
It makes.The method of tubulation is：Framework of steel reinforcement is fixed in vertical Pipe making mold, then polyvinyl alcohol fiber reinforced cement mortar is mixed
It closes in object filling mold.Reinforcing bar is Ribbed Bar, elasticity modulus 209GPa, yield strength 600MPa.Framework of steel reinforcement is by 6
The longitudinal reinforcement (diameter 5mm) of root equidistant placement and the circumferential reinforcement (diameter 4mm) being spirally wound on vertical muscle composition, ring
It is 50mm to reinforcing bar screw pitch.Framework of steel reinforcement uses automatic reducing reinforced bar skeleton seam welder by the company between longitudinal reinforcement, circumferential reinforcement
Contact welds together.The circular diameter that circumferential reinforcement axis surrounds be 395mm, i.e., the inner wall of circumferential reinforcement axis to production tube away from
From 2/5 for entire pipe thickness.Filler in three times when being filled to the 1/3 of mold height every time, starts flat vibrating table vibration 1
Minute.It is demoulded after standing 24 hours in die surface covering rear chamber, then using the covering of wet gunnysack watering natural curing 28 days.It presses
《Test methods of concrete and reinforced concrete drainage and sewer pipes GB/T16752-2006》Specified in test method (i.e. three point test
Method) test of bearing capacity is carried out to high performance cement-based composites pipe.At A point in accurate LVDT displacement meter measurement attached drawing 2
The displacement w of vertical direction uses intelligent crack width tester measurement crack width (precision 0.01mm).Measure tube top external pressure
The relation curve (i.e. P-w curve) of load and w are as shown in Fig. 8.Failing load Pmax=45.4kN/m, tube top is displaced when destruction
wu=14.83mm.Using linear function fit, three sections of linear functions are obtained, degree of fitting reaches 0.95 or more.As it can be seen that external pressure lotus
Load-displacement curve can be divided into three phases, successively be known as elastic stage, hardening phase and cracking by with the increased sequence of load
Stage.
According to the above-mentioned definition to f and δ, f- δ curve shown in attached drawing 9 can be obtained as attached drawing 8.If only retained in attached drawing 9
Dotted line, then can obtain attached drawing 3.Identical as P-w curvilinear characteristic, f- δ curve includes elastic stage, hardening phase and cracking stage etc.
Three phases.(δ in attached drawing 9f, ff) and (δc, fc) it is elastic stage, hardening phase and two point of interfaces between the cracking stage.?
In the present embodiment 2, the specific value of each symbol is：δf=0.06；δc=0.37；ff=0.30；fc=0.72.I.e.：Two point of interfaces
Corresponding normalization load is respectively 0.30 and 0.72, and the corresponding normalized displacements of two point of interfaces are respectively 0.06 and 0.37.
In test as it can be seen that into after hardening phase, the Tension Stress Zones such as 5 inner wall of tube top, 6 outer wall of pipe waist, 7 inner wall of tube bottom can
See a plurality of fine and closely woven crackle, crackle number is increasing, and crack width is more stable, and crack width is 0.04~0.2mm.With lotus
Load continues to increase, and into the cracking stage, pipe surface crack width is obviously increased, and external pressure load increases slow.
When the internal diameter and wall thickness for changing pipe, it is 1000mm, the wall thickness 60mm of the pipeline, pipe range 2.5m, warp that internal diameter, which is such as made,
It crosses and tests visible similar rule.The bellmouth of the pipeline, socket can also be according to《Concrete and reinforced concrete drainage and sewer pipes GB/
T11836-2009》Middle flexible joint c-type bell and spigot pipe fitting manufacture.If wall thickness allows, high performance cement-based composites pipe can
With according to《Concrete and reinforced concrete drainage and sewer pipes GB/T11836-2009》The manufacture of flexible joint A type bell and spigot pipe fitting.
Embodiment 3：
It is 375mm, the high performance cement-based composites pipe of wall thickness 25mm, pipe range 2.5m that internal diameter, which is made, by embodiment 2.
Still use《Test methods of concrete and reinforced concrete drainage and sewer pipes GB/T16752-2006》In triangle test
Device, loading sequence are：Load control mode is first used, (pipe unit length is applied loading speed 5.0kN/m per minute
Load), it is unloaded to 0kN/m again after being loaded into a certain peak value from 0kN/m every time.Peak value be respectively 3.13kN/m, 6.25kN/m,
9.38kN/m,12.5kN/m,15.63kN/m,18.75kN/m,21.88kN/m,25.0kN/m.Then, Bit andits control side is used instead
Formula is loaded, and loading speed 0.6mm/min is unloaded after being loaded onto 31.25kN/m.Finally, displacement-control mode is added
It carries, loading speed 0.6mm/min is unloaded after being loaded onto tube damage.Lead at A point in the tube top external pressure load and attached drawing 2 measured
The displacement relation curve in vertical direction, as shown in Fig. 10.From attached drawing 10 as it can be seen that when load peak value be respectively 3.13kN/m,
When 6.25kN/m, 9.38kN/m, 12.5kN/m, load and unloading curve are essentially coincided, recoverable deformation invariably, and pipe is in elasticity
Stage.Then, when load peak value increases, occurs irrecoverable deformation after unloading, and as load peak value increases after unloading not
Recoverable deformation also increases.The variation of ring stiffness when to analyze different load peak values needs to choose load and tube top displacement in line
The stage of sexual intercourse is calculated.By attached drawing 10 as it can be seen that when load peak value is more than 12.5kN/m, the good linearity of unloading curve,
Therefore unloading curve is chosen to calculate ring stiffness.And when load peak value be less than or equal to 12.5kN/m when, choose loading curve and
Unloading curve.Ring stiffness is calculated to be chosen with reference to GB/T9647-2003, and formula is as follows：
SNi=(0.0186+0.025 Δi/d)Pi/Δi (4)
In formula：SNiRing stiffness when being loaded for i-th, unit N/m/m.I=9 (is finally loaded into destruction in this embodiment
Ring stiffness is not calculated when load).D is the internal diameter of pipe.PiPeak load when being loaded for i-th, unit N/m.ΔiFor unloading
When the displacement of recoverable tube top vertical direction, unit m.PiAnd ΔiObtaining value method see mark shown in attached drawing 10.Table 3 is the pipe
Ring stiffness situation of change under different external pressure loads.In table 3, according to the f obtained in embodiment 2f=0.3, fc=0.72 determines
Elastic stage and hardening phase.As it can be seen that ring stiffness varies less in elastic stage, the ring stiffness average value conduct in the stage is taken
Elastic stage ring stiffness；Into hardening phase, as external pressure load increases, ring stiffness reduces, and hardening phase ring stiffness is elasticity
The 40%~80% of stage ring stiffness, in 42.7%~79.0% range preferably.
Embodiment 4：
In addition to not mixing vinal, reinforcing bar element mortar is made with embodiment 1 in other materials proportion and preparing process
Pipe, bore 375mm, wall thickness 25mm, pipe range 2.5m.Test method is the same as embodiment 2.Obtain the maximum external pressure lotus that outlet pipe is born
Carry Pmax=11.5kN/m, reaches PmaxWhen A point at vertical direction displacement wu=4.05mm.As it can be seen that reinforcing bar element mortar pipe is held
Loading capability is far below high performance cement-based composites pipe.External pressure load corresponding to reinforcing bar element mortar pipe elastic stage is less than
4.0kN/m is split more than that can only see single in Tension Stress Zones such as 5 inner wall of tube top, 6 outer wall of pipe waist, 7 inner walls of tube bottom after this range
Line, no a plurality of hair check phenomenon occur, and crack width is more than 0.2mm.Tube top external pressure load and tube top displacement relation curve are not only
Sliding, there is load and decline phenomenon suddenly in many places, this is mainly related with crack propagation and reinforcement yielding.Similar embodiment 3, to reinforcing bar
Plain mortar pipe carries out repeating load, unloading test.Table 4 is ring stiffness variation of the reinforcing bar element mortar pipe under different external pressure loads
Situation.In elastic stage, ring stiffness is varied less, and takes the average value of first three groups data as elastic stage ring stiffness.With outer
Load is pressed to increase, ring stiffness reduces, and ring stiffness is the 71.3~81.3% of elastic stage ring stiffness, and amplitude of variation is lower than high-performance
Cement-base composite material pipe.
Embodiment 5：High performance cement-based composites control for when, the raw material of polyvinyl alcohol fiber reinforced cement mortar
Quality mixture ratio is carried out by table 5, raw material and the preparation method is the same as that of Example 1, and polyvinyl alcohol fiber reinforced cement mortar is made
Elastic mould value is 10~25GPa, and compression strength is 25~60MPa, and tensile strength is 3~8MPa, and limit tensile strain is
0.02~0.06.Manufactured high performance cement-based composites pipe reaches effect identical with embodiment 2, embodiment 3.
1 high performance cement-based composites thickness of pipe wall of table
The main chemical compositions (mass ratio) of 2 metakaolin of table
3 high performance cement-based composites of table ring stiffness under different external pressure loads changes
4 reinforcing bar element mortar pipe of table ring stiffness under different external pressure loads changes
The raw material quality match ratio of 5 polyvinyl alcohol fiber reinforced cement mortar of table
Claims (7)
1. a kind of high performance cement-based composites pipe, it is characterised in that：The pipe uses polyvinyl alcohol fiber reinforced cement mortar
（2）, framework of steel reinforcement（3）It is made；One end of the pipe is bellmouth（1）, the other end is socket（4）, bellmouth（1）And socket（4）Mutually
Cooperatively form pipeline；
The polyvinyl alcohol fiber reinforced cement mortar is less than or is waited with cement, I grades of flyash, metakaolin and partial size
It is basis material in the sand of 0.60 mm, incorporation water, vinal, polycarboxylate water-reducer and viscosity modifier mixing form；
The quality proportioning of the raw material is cement：I grades of flyash：Metakaolin：Sand：Water：Vinal；Polycarboxylic acids diminishing
Agent：Viscosity modifier=1：1.2~2.4：0~0.11：1~1.52：0.68~1.04：0.050~0.076: 0.009~0.013:
0.00056~0.00085；
The polyvinyl alcohol fiber reinforced cement mortar, elastic mould value are 10 ~ 25 GPa, and compression strength is 25 ~ 60
MPa, tensile strength are 3 ~ 8 MPa, and limit tensile strain is 0.02 ~ 0.06.
2. high performance cement-based composites pipe according to claim 1, it is characterised in that：The pipe uses triangle test
Apply quasi-static loading when, with external pressure load increase its external pressure load-tube top displacement relation curve include elastic stage, hardening phase and
In the cracking stage, in elastic stage unloading, deformation can restore completely；In hardening phase and the unloading of cracking stage, deformed part
Restore.
3. high performance cement-based composites pipe according to claim 2, it is characterised in that：The pipe in hardening phase,
In the visible a plurality of fine and closely woven crackle of the Tension Stress Zones such as Guan Yaochu outer wall, tube top inner wall, tube bottom inner wall, crackle number is increasing, splits
Line width is 0.04 ~ 0.2mm.
4. high performance cement-based composites pipe according to claim 2, it is characterised in that：Ring of the pipe in hardening phase
Stiffness, the ring stiffness of hardening phase are the 40% ~ 80% of elastic stage ring stiffness.
5. high performance cement-based composites pipe according to claim 2, it is characterised in that：Described is high-performance cement-based
Composite material tube, after external pressure load, tube top displacement are normalized with tube top vertical direction displacement when failing load, destruction respectively,
It include two point of interfaces, the corresponding normalization load difference of two point of interfaces between elastic stage, hardening phase and cracking stage three
For 0.25~0.35 and 0.60~0.75, the corresponding normalized displacements of two point of interfaces are respectively 0.05~0.01 and 0.30~
0.40。
6. according to claim 1 to any high performance cement-based composites pipe in 5, it is characterized in that manufacturing in identical
Diameter, same bearer ability cement concrete pipe technical requirements under, the thickness of pipe wall be ordinary reinforced concrete thickness of pipe wall 30%~
88%。
7. according to claim 1 to any high performance cement-based composites pipe in 5, it is characterised in that：The pipe is burying
Behind ground, working normally section includes elastic stage and hardening phase.
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| DE3272613D1 (en) * | 1982-11-16 | 1986-09-18 | Schwiete Rolf | Method for restoration of steel reinforced concrete |
| CN2746235Y (en) * | 2004-08-27 | 2005-12-14 | 黄博 | Female end and socket rolling suspension processed reinforced concrete pipe |
| CN1308134C (en) * | 2005-07-07 | 2007-04-04 | 哈尔滨工业大学星河实业有限公司 | Steel band reinforced plastic drainpipe and method and apparatus for manufacturing the same |
| CN101592266A (en) * | 2008-05-29 | 2009-12-02 | 天津万联管道工程有限公司 | A kind of fiber concrete pipe |
| CN201339771Y (en) * | 2008-12-12 | 2009-11-04 | 天津万联管道工程有限公司 | Earthquake-resistance protecting pipe for petroleum and natural gas pipeline |
| CN103253918B (en) * | 2013-04-24 | 2015-01-07 | 中国石油大学(北京) | Self-repairing anti-shrink cement based composite material |
| CN204533911U (en) * | 2015-04-23 | 2015-08-05 | 彭州市新德水泥制品有限公司 | A kind of Novel reinforced concrete bell-and-spigot pipe |
| CN104909648A (en) * | 2015-05-21 | 2015-09-16 | 玖青新材料科技（上海）有限公司 | Fiber-enhanced cement-based composite material |
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